Back in university, it was an iPad mini 5, using Notability. Notability has enshittified badly though.

These days (I’m no longer in university so I do write a lot less), I write on a Kobo.

It does. I vastly prefer writing notes by hand than typing em. But my handwriting sucks when I have to write quickly, and I also don’t like lugging around giant stacks of paper. And so I settled on a digital writing pad, and just do the work to type my notes later. Acts as revision too.